Endocarpon

About

Endocarpon is a genus of saxicolous (rock-dwelling), squamulose lichens in the family Verrucariaceae. It comprises 23 species. The genus is characterised by its enclosed fruiting bodies (perithecia) embedded within the scales and its compartmentalised spores. Species in this genus typically grow on rocks, often in areas that experience periodic moisture.

Summary from Wikipedia